Serena Williams hit 31 winners – which included a whopping 15 aces – to just 18 unforced errors. Serena Williams also didn’t drop a serve in the match at the Melbourne Park. Williams is now through to the semi-finals here for the first time since capturing the title five years ago, having won here five times in 2003, 2005, 2007, 2009 and 2010, more than any other woman in the Open Era. (IANS)